334 INFLUENZA 



The fact that the lesions are so much exposed renders the dis- 

 ease especially favorable for topical applications. 



, DESCRIPTION OF PLATE VIII. 



1. Early stage of meinbraite forniatioJi in the throat of a pigeon. 



2. A section from an advanced stage in which the uiiicosa is covered 

 with a thick grayish necrotic exudate. 



3. A later stage 7vhere the exudate has sloughed. 



REFERENCES. 



1. Moore. A preliminary investigation of diphtheria in fowls. 

 Bulletin No. S. U. S. Bureau of Animal Industry. 1S95. 



2. Salmon. The diseases of poultry. 1899. p. 216. 



INFLUENZA. 



Synonyms. Epizootic catarrhal fever ; epizootic catarrh; 

 horse distemper ; pink eye ; mountain fever ; shipping fever. 



^ 251. Characterization. Influenza is an acute infec- 

 tious disease characterized by a rise of temperature and a ca- 

 tarrhal condition of one or more of the mucous membranes, 

 more especially of the head. One or more of the internal 

 organs may become affected. It usually appears in epizootic 

 form. It is a disease of horses although asses and mules are 

 susceptible and a few cases are reported of its being transmit- 

 ted to man and to dogs. 



Influenza is a generic term employed to designate a large 

 variety of symptoms. A somewhat careful analysis of its mani- 

 festations suggests that possibly it includes a number of etiolog- 

 ically distinct diseases /. e. morbid conditions brought about by 

 different causative factors. The term has long been employed 

 to designate a considerable variety of equine epizootics the in- 

 dependence of which could not be established. The disease, 

 as it is seen in the horse, suggests further that possibly it is in 

 its beginning, a general affection because of the early rise of 

 temperature and that later in its course it becomes, to a 

 limited extent, localized. At present, influenza is restricted 

 to groups of symptoms and lesions in the horse that are not 



